Article
Materials Science, Multidisciplinary
Xiulan Li, Xiao Jiang, Xinjun Zhou, Jia Wang, Bo Huang, Xudong Zhang
Summary: The microstructure and mechanical properties of WC-Cu-10Ni-5Mn-3Sn-1.5TiC cemented carbides fabricated at 1200 degrees C for 90 min with different Ce2O3 contents were investigated. Ce2O3 accelerated the decomposition and dissolution of WC, leading to changes in the microstructural properties. The addition of Ce2O3 also affected the mechanical properties, with the sample containing 0.4 wt% Ce2O3 showing the highest hardness, and the sample with 0.6 wt% Ce2O3 exhibiting the highest impact toughness and TRS.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Huaizhuang Luan, Jie Chen, Rutie Liu, Xiang Xiong, Fangping Ouyang, Junhao Yang
Summary: Pre-sintered Fe-WC-Mo2C-Cr3C2-VC-C alloy was studied for its microstructure and evolution of internal pores during the exhaust process. The gas produced by deoxidation significantly affected the densification process, resulting in expansion and shrinkage of the pre-sintered sample. The oxygen content was significantly reduced after the carbothermal reaction.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Ceramics
Xinjun Zhou, Zhengfu Zhang, Xiulan Li, Xudong Zhang, Manjiao Chen
Summary: WC-based cemented carbides with different TiC contents were synthesized by pressureless melt infiltration, and it was found that an increase in TiC content promotes the formation and growth of new phases, leading to improvements in hardness and fracture strength while decreasing impact toughness.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Erijanio Nonato da Silva, Alessandra Agna Araujo dos Santos, Rubens Maribondo do Nascimento, Salete Martins Alves, Renan da Silva Guimaraes, Marcello Filgueira
Summary: The study proposed the fabrication of WC-6.4Fe-3.6Ni hard metal alloy using spark plasma sintering as an alternative to WC-Co, with the results showing that increasing sintering temperature improved microstructure and hardness but decreased fracture toughness. Wettablity of the Fe-Ni binder during heating in the SPS process contributed to enhanced densification and properties, while the decrease in fracture toughness was attributed to a decrease in binder mean free path.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Rina K. Mudanyi, Corson L. Cramer, Amy M. Elliott, Kinga A. Unocic, Qianying Guo, Dhananjay Kumar
Summary: W-ZrC composites were successfully prepared by reactive melt infiltration, with the processing time affecting phase conversion and hardness. Un-sintered WC preforms exhibited better infiltration compared to sintered ones, and longer reaction times led to increased W and ZrC phases.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Xun Li, Junfei Zhang, Qiang Zhang, Xianwei Zhang, Vincent Ji, Jinlong Liu
Summary: WC-13Co (wt.%) composite with Fe added was fabricated via pressureless sintering. The microstructure and mechanical properties were investigated using X-ray Diffraction (XRD), Scanning Electronic Microscopy (SEM), Energy Dispersive Spectroscopy (EDS), and Vickers hardness tester. The effect of Fe and C content on the microstructure and mechanical properties in the W-Co-Fe-C system was quantitatively analyzed, and the position of added Fe in the lattice of the composites was clarified. The growth behavior of WC in liquid CoFe was found to be different from that in liquid Fe.
Article
Materials Science, Coatings & Films
M. S. Mahdi, S. Sanjabi
Summary: To improve the interface in Ni/WC infiltration brazed coatings, a thin shell of Cu/Co-P was employed. The proposed coating had very low porosity, resulting in a dense free porosity coating with a homogenous distribution of WC. The coating exhibited a reduced growth rate of WC and improved wear property and hardness compared to conventional WC/NiCrBSi coatings.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
M. A. Yousfi, A. Nordgren, S. Norgren, J. Weidow, H. -O. Andren, L. K. L. Falk
Summary: Un-doped and Cr-doped WC-10 vol% Co cemented carbides with a grain size of 1.4 μm were studied for their creep behavior under high temperature and high pressure conditions. The results showed that the Cr-doped material exhibited higher creep resistance at lower temperatures and slower grain growth. Additionally, the redistribution of the binder phase and infiltration of grain boundaries were observed during grain boundary sliding, and the formation of intergranular cavities was observed. It is suggested that the growth of WC grains perpendicular to the load axis is the rate-limiting step in the creep deformation, and the segregation of Cr to WC/binder phase boundaries inhibits grain growth.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
O. O. Matviichuk, I. Andreiev, I. O. Hnatenko, O. Ievdokymova, S. A. Davydenko, M. O. Tsysar
Summary: Mesostructural WC-Co or WC-Ni hard alloys with high hardness and microhardness can be obtained through ordinary liquid-phase sintering. These alloys are efficient in mining tools and heavily loaded friction couples.
Article
Materials Science, Multidisciplinary
Rohit Singh, Varun Sharma, Pulak M. Pandey
Summary: This paper presents a new approach of rapid tooling technique using 3D printed pattern and microwave sintering to develop cutting inserts with built-in coolant channels. Microwave sintering enables rapid and uniform heating, resulting in high hardness and toughness of the inserts. The internal coolant channels enhance the cooling effect and improve the machining performance of the inserts.
MATERIALS CHARACTERIZATION
(2023)
Article
Mechanics
Edwin Gevorkyan, Tatiana Prikhna, Ruslan Vovk, Miroslaw Rucki, Zbigniew Siemiatkowski, Wojciech Kucharczyk, Vladymir Chishkala, Leszek Chalko
Summary: This paper describes the research results on nanostructural composite ZrO2 - WC obtained with modified Field Assisted Sintering, showcasing improved mechanical properties through reduced temperature and shorter sintering time, particularly impressive results were achieved in wear resistance, outperforming market standards.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Guangkai Fang, Huaguo Tang, Zhongkan Ren, Yue Cheng, Yuan Yu, Lujie Wang, Tongyang Li, Yanfei Zhang, Zhuhui Qiao
Summary: Two WC-6wt%Co cemented carbides with different grain sizes were prepared and investigated for their oxidation resistance at temperatures ranging from 600 to 800 degrees Celsius. The ultrafine-grained cemented carbide demonstrated decreased resistance to oxidation at low temperatures due to increased grain boundaries. However, at 800 degrees Celsius, the fine-grained cemented carbide showed poorer oxidation resistance than the ultrafine-grained one, attributed to larger intergranular fracture and disintegration behavior. The oxidation thermodynamics of WC/Co cemented carbide were discussed, and the color inconsistency of the two samples was observed and explained.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Chemistry, Physical
Weiyou Chen, Zengbin Yin, Xuelin Li, Juntang Yuan
Summary: Microwave sintering is an efficient method for preparing WC-10Co cemented carbide tool materials. Co-doped additives of metal carbides and rare earth oxide were found to significantly enhance the mechanical properties of the microwave-sintered cemented carbide. The WC-10Co-0.3Cr(3)C(2)-0.3VC-0.3Mo(2)C sintered at 1400 degrees C with a holding time of 10 min exhibited the best mechanical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Multidisciplinary
Dang Xu, Bangzheng Wei, Ruizhi Chen, Rui Zhou, Jian Yang, Pengqi Chen, Jigui Cheng
Summary: In this study, WC@W core-shell structured W-Cu composites were prepared using a novel microwave-heating salt-bath carbonization method. The addition of graphite improved the high-temperature mechanical properties and wear resistance of the composites. Compared to conventional composites, the composites with 0.9 wt% graphite showed higher thermal conductivity, hardness, bending strength, compressive strength, and improved wear resistance.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Daniel Willemam Trindade, Renan da Silva Guimaraes, Rafael Delorence Lugon, Elias Rocha Goncalves Junior, Alessandra Agna Araujo dos Santos, Marcello Filgueira
Summary: Hardmetals are widely used for cutting, machining, and drilling rocks due to their excellent properties. This study evaluated the fracture toughness of WC-10% Co carbide using a modified Palmqvist test and compared the results with six different conventional models. The findings showed significant differences among the models, with the Lankford equation exhibiting the largest variation.
Article
Nanoscience & Nanotechnology
Kang Wang, Daya Ren, Xiang Zan, Laima Luo, Xiaoyong Zhu, Yucheng Wu
Summary: This study investigated the recrystallization behavior of pure tungsten after 90% thickness reduction by hot rolling through isothermal annealing. Electron Backscatter Diffraction and hardness measurement were used for microstructural and textural characterization, revealing the kinetics of recrystallization and mechanical properties evolution. The hot-rolled tungsten plate mainly underwent meta-dynamic recrystallization during annealing, and the activation energy for half the recrystallization process was calculated.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Nuclear Science & Technology
Yue Xu, Yunfeng Xu, Zuosheng Wu, Laima Luo, Xiang Zan, Gang Yao, Ya Xi, Yafeng Wang, Xiaoyu Ding, Hailin Bi, Xiaoyong Zhu, Qiu Xu, Jiefeng Wu, Yucheng Wu
Summary: The PSIEC is a laboratory-scale linear plasma device designed for studying plasma-material interactions for fusion reactor applications. It can generate continuous plasmas of various gases and has been used to conduct initial plasma exposure experiments on tungsten materials and coatings. Preliminary results suggest that nanocrystalline tungsten may be a promising candidate for plasma-facing materials due to its unique microstructure.
FUSION ENGINEERING AND DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Zhi-Hao Zhao, Gang Yao, Lai-Ma Luo, Xiang Zan, Qiu Xu, Yu-Cheng Wu
Summary: An investigation into the tensile properties of WYZ alloys with different orientations and recrystallization states at high temperatures showed that recrystallization annealing increased ductility but decreased strength. Orientation and annealing had no significant effect on ductile-to-brittle transition temperature (DBTT) from tensile data, although increasing strain rate would overestimate DBTT.
JOURNAL OF NUCLEAR MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Yu Yang, Lai Ma Luo, Xiang Zan, Xiao Yong Zhu, Liu Zhu, Yu Cheng Wu
Summary: By doping WC-8Co cemented carbide with Y2O3/ZrO2 using wet chemical method, this study achieved improved comprehensive properties in the alloy.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Zhi-Hao Zhao, Gang Yao, Lai-Ma Luo, Xiang Zan, Qiu Xu, Yu-Cheng Wu
Summary: The study investigated the anisotropy and stability of the mechanical properties of a Y-Zr-O reinforced W alloy plate through compression tests, revealing higher recrystallization temperature and increased strength for the WYZ alloy. The study found that the strength ranking of different orientations was rolling direction > transverse direction > normal direction, and that the WYZ alloy could achieve comparable ultimate compressive strength through recrystallization annealing.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2021)
Article
Nuclear Science & Technology
Kang Wang, Ya Xi, Xiang Zan, Laima Luo, Yucheng Wu
Summary: The annealing behaviors of rolled pure tungsten plates with different thickness reduction ratios were investigated by hardness degradation during isothermal annealing at 1250 degrees C. The recrystallization rate was found to increase with increased rolling thickness reduction ratios, and the rolled texture was more random than the recrystallized one.
FUSION ENGINEERING AND DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Gang Yao, Xue-Peng Liu, Zhi-Yuan Zhao, Zhi-Hao Zhao, Lai-Ma Luo, Ji-Gui Cheng, Xiang Zan, Qiu Xu, Yu-Cheng Wu
Summary: In this study, W-(Y0.9La0.1)(2)O-3 composite powders were successfully fabricated and the optimal temperature and pressure conditions were determined through sintering experiments. The performance of the composite material under thermal shock and irradiation was investigated, showing that fine-dispersed composites have improved resistance to helium ion irradiation and laser thermal shock.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Gang Yao, Hong-Yu Chen, Zhi-Hao Zhao, Lai-Ma Luo, Yong Ma, Ji-Gui Cheng, Xiang Zan, Qiu Xu, Yu-Cheng Wu
Summary: W-Y2O3-ZrO2 composite materials were successfully fabricated by a combination of wet chemical method and spark plasma sintering. The materials were systematically studied at different Y and Zr doping atomic ratios. Ultrafine tungsten-based composites with dispersed Y2Zr2O7 particles were prepared by appropriate doping ratios. The presence of nano-Y2Zr2O7 particles greatly enhanced the resistance to high temperature annealing and helium ion irradiation.
JOURNAL OF NUCLEAR MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Daya Ren, Ya Xi, Jie Yan, Xiang Zan, Laima Luo, Yucheng Wu
Summary: This study investigates the performance of yttria particle-reinforced tungsten plates under heat loads through indirect coupling experiments. The results show that surface damage aggravates with increased laser power density, and recrystallization accelerates cracks and melting damage, leading to a decrease in material's ability to withstand thermal shock.
Article
Nuclear Science & Technology
Yong -Qiang Qin, Yi Zhuang, Yue Wang, Yi -Fan Zhang, Lai -Ma Luo, Xiang Zan, Yu -Cheng Wu
Summary: In this study, CuCrZr alloy with 3 wt.% WC was successfully prepared by MA-SPS method, and the microstructure and performance of the composite material were characterized. The results showed that the addition of WC greatly improved the strength of the alloy, while slightly reducing its plasticity and conductivity. It was also found that there were particles with ZrC-W2C-WC core-shell structure in the alloy, which improved the interface between the matrix and the WC particles.
FUSION ENGINEERING AND DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Yun -Feng Xu, Yue Xu, Lai-Ma Luo, Xiang Zan, Yu-Cheng Wu
Summary: Tungsten coatings with different morphologies and microstructures were prepared on a steel substrate, and their performance under He plasma irradiation was studied. The coating deposited at 40 W exhibited a unique needle-like morphology and uniform grain size, showing excellent resistance to He plasma. The surface damage morphology of the coating under different irradiation fluence was investigated, and the severity of damage increased with ion fluence.
Article
Chemistry, Multidisciplinary
Ya Xi, Gaoyong He, Xiang Zan, Kang Wang, Dahuan Zhu, Laima Luo, Rui Ding, Yucheng Wu
Summary: The microstructure and damage of the upper divertor components in EAST were analyzed using metallography, EBSD, and SEM. The components exhibited cracking, recrystallization, and interface debonding due to the combined effects of heat load and plasma irradiation. Cracks propagated downward along the heat flux direction, displaying intergranular fracture. The thermal loads caused recrystallization and the formation of cracks in both recrystallized and rolled areas. EBSD boundary maps revealed the recrystallization area determined by the heat flux distribution. Debonding occurred at the Cu/CuCrZr interface of cooling components near the thermal loading area, leading to structural integrity damage.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Multidisciplinary
Wang-Zhi Xu, Jing Wang, Lai-Ma Luo, Xiang Zan, Yu-Cheng Wu
Summary: W-10Re alloy was successfully synthesized by wet chemistry and spark plasma sintering methods. The optimal reduction temperature for the W-10Re powders was found to be in the range of 1000-1100 degrees C, resulting in good mechanical properties of the alloy.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Wang Yafeng, Chen Zhihong, Xu Yunfeng, Luo Laima, Zan Xiang, Zhu Xiaoyong, Wu Yucheng
Summary: The damage behavior of W28Ta28V28Zr8Sc8 high-entropy alloy under low-energy and high-flux helium ions irradiation condition was investigated. The high-entropy alloy shows better resistance to irradiation damage compared to pure W under the same irradiation condition. The Fuzz layer thickness of the high-entropy alloy is significantly smaller and the threshold energy for the appearance of serious Fuzz structure is higher than that of pure W.
RARE METAL MATERIALS AND ENGINEERING
(2023)
Article
Materials Science, Multidisciplinary
Ziyan Zhao, Kaiyue Zheng, Xianghui Yu, Qian Qi, Lujie Wang, Yan Liu
Summary: In-situ TiC/Ni composites with Ta element were fabricated by reactive sintering. It was found that Ta element could reduce the oxidation rate and decrease the content of TiO2 and NiTiO3 in the oxide scale, thereby optimizing the oxidation resistance and electrical conductivity of the composites.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Kai Wang, Mingyuan Ma, Yingchun Diao, Qijun Huang, Xiangkui Zhou, Guojian Li, Qiang Wang
Summary: The relationship between the V(C, N) content and the thickness of the gradient layer in nanocrystalline cemented carbides was investigated. The introduction of V(C, N) was found to enhance the mechanical properties of these materials.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Claudio Bertalan, Steven Moseley, Leonel Pereira, Ralph Useldinger
Summary: The influence of sintering temperature, dwelling time at maximum temperature and carbon content on the microstructure and mechanical and magnetic properties of WC-6%Co hardmetal was investigated. Results showed that to maximize hardness and transverse rupture strength (TRS), sintering should be performed at a low temperature (< 1400°C) and with a dwelling time of at least 75 minutes. This is particularly important for low carbon parts to ensure the necessary microstructure homogeneity required for high TRS.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Longlong Sun, Hang Li, Ningxin Wei, Jianliang Li, Jiewen Huang, Jian Kong, Qiujie Wu, Yan Shi, Dangsheng Xiong
Summary: By regulating the microstructure of TaBx films deposited by magnetron sputtering, the hardness and wear resistance of the films can be improved. With the increase of the bias voltage, the B content decreases and the crystallinity is enhanced. The microstructure of the films transforms from fibrous to dense columnar and then to granular structure. At a bias voltage of -180 V, the films exhibit super high hardness and relatively moderate fracture toughness.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Liang Xia, Kai Liu, Yucheng Cao, Chao Jiang
Summary: This study investigates the microstructure information and mechanical behavior of ion-irradiated zirconium alloys through experimental measurements and theoretical analysis. Experimental procedures involve Au3+ irradiation of specific alloys, and transmission electron microscopy analysis reveals the formation of precipitates and their transformation after ion-irradiation. Macroscopic mechanical properties are characterized by nano-indentation tests, revealing significant indentation size effect and irradiation hardening behavior. A mechanistic model is developed to explain the depth-dependent hardness observed in ion-irradiated zirconium alloys.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Jiangtao Zhang, Guoqin Huang, Yangli Xu, Jianyu Wang, Guangyao Han, Yuanqiang Tan
Summary: Selective laser melting (SLM) provides a novel method for the integrated production of structural and functional metal-matrix diamond composites in the field of diamond tools. In this study, a discrete element method model is developed to simulate the spreading process of diamond/CuSn composite powders. The findings reveal that adjusting the physical properties of diamond particles and process parameters can improve the powder bed quality and particle dynamics, leading to better performance of diamond tools.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Roman Gabor, Ladislav Cvrcek, Karel Masek, Josef Hlinka, Oldrich Motyka, Jan Walter, Grazyna Simha Martynkova, Gabriela Mikeskova, Jana Seidlerova
Summary: This study investigated the surface modification of β-Ti39Nb alloy using micro-arc oxidation technique, and examined the relationships between surface chemical composition, morphology, and tribological and corrosion properties. The results showed that the technique improved the wear resistance of the alloy, and the particle analysis confirmed the correlation between particle composition and tribological parameters.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Benedetto Bozzini, Matteo Amati, Luca Gregoratti, Majid Kazemian, Francesco Tavola, Sandra Tedeschi, Gian Pietro De Gaudenzi
Summary: In this study, the composition and chemical state of the surface of hardmetal subjected to controlled electrochemical corrosion were analyzed using synchrotron-based scanning photoelectron microscopy and photoelectron microspectroscopy. The results showed that corrosion under different conditions led to surface enrichment and leaching of different chemical elements and species.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
B. Roebuck, M. G. Gee, K. P. Mingard, H. G. Jones, H. Zhang, V. Tong
Summary: Metrology provides scientific support for the practical use of testing standards and helps establish a common language for different users regarding material capabilities. The hardmetal industry already has numerous international standards, but there is still room for improvement in certain testing strategies. The Materials Group at the National Physical Laboratory in the UK focuses on metrology and has highlighted specific metrological issues that need further attention. These include high hardness measurements, dislocation analysis, micro-tribology, nanoindentation, and structural characterization.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Suyeon Kim, Taehyun Kwon, Seulgi Kim, Sung Ho Song, Dongju Lee
Summary: This study examines the effect of two different methods, oxide reduction and mechanical alloying, on the sintering behavior and microstructure of molybdenum-tungsten sintered compacts. The sintered compacts produced with oxide-reduced nanopowders exhibit higher density, purity, and a finer microstructure, making them more suitable for sputtering targets.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
A. M. Ferro Rocha, A. M. Santos, R. Mineiro, P. Pereira, J. Sacramento, A. M. R. Senos, A. C. Bastos
Summary: This study compares the corrosion resistance of different hardmetal composites and their binders in a corrosive environment. Through electrochemical testing methods, the corrosion behavior of these materials was studied, and the influence of the binder's electrochemical behavior on the corrosion resistance of hardmetal was explored.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Bo Li, Yong Zheng, Wangwang Wang, Hao Wu, Yufan Li, Jin Lv
Summary: The effects of various Cr doping amounts on the microstructure and properties of Mo2FeB2-based cermets were investigated using EDS, SEM, and TEM. The results showed that moderate Cr doping enhanced the system's wettability, fracture toughness, and transverse rupture strength, while excessive Cr addition decreased mechanical properties. The solid-solution of Cr in the hard phase had the most pronounced effect on the mechanical properties of the cermets.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Min Lian, Fei Wang, Kaixuan Rong, Xiaoci Ma, Hetian Liu, Xinmiao Gai, Yufei Ge, Shushan Dong, Qiang Tao, Pinwen Zhu
Summary: This study successfully optimized the toughness of polycrystalline diamond (PCD) by adjusting the intergranular fracture (IF) and transgranular fracture (TF) modes. The results showed that a mixture of the IF and TF modes resulted in higher hardness and toughness in PCD compared to a single fracture mode. The toughness of the PCD was approximately three times that of single-crystal diamonds and comparable to that of pure nanotwinned diamonds. The mixed modes introduced toughening mechanisms such as high frequency large crack deflection, crack bridging, pull-out, and crack branching, which increased the toughness of the PCD.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Ruifang Wang, Xiang Zhan, Yongqiang Chen, Chao Zhang, Yusi Che, Jilin He
Summary: The particle size and morphology of tungsten powders play a crucial role in determining the processing properties of tungsten products. This study investigated the effects of water vapor partial pressure on the hydrogen reduction of tungsten oxides, and proposed a method of changing the particle size of tungsten powders using bottom blowing hydrogen. The experimental results showed that bottom-blowing hydrogen could improve the uniformity of tungsten powders in a crucible by eliminating discrepancies in water vapor partial pressure. The partial pressure of water vapor increased with the temperature of the water bath, leading to an increase in the average particle size of tungsten powders.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Oladapo Eso, Xu Wang, Samuel Wolf, Travis Puzz
Summary: In recent decades, there has been an increasing trend in incorporating alloying additives into WC-Co hardmetals for property enhancement. This paper establishes correlations between properties and microstructure of binder modified WC-Co compositions, and explains the observed property correlations.
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
(2024)